LINER LT5534ESC6

LT5534
50MHz to 3GHz
RF Power Detector
with 60dB Dynamic Range
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FEATURES
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DESCRIPTIO
The LT®5534 is a 50MHz to 3GHz monolithic RF power
detector capable of measuring RF signals over a 60dB
dynamic range. The RF signal in a decibel scale is precisely
converted into DC voltage on a linear scale. The 60dB input
dynamic range is achieved using cascaded RF detectors
and RF limiters. Their outputs are summed to generate an
accurate log-linear DC voltage proportional to the input RF
signal in dB. The output is buffered with a low output
impedance driver. The LT5534 delivers superior temperature stability (typical output variation within ±1dB over the
full temperature range). The output responds in less than
40ns to a large RF input signal.
RF Frequency Range: 50MHz to 3GHz
Linear Dynamic Range: 60dB
Exceptional Accuracy over Temperature
and Power Supply
Fast Transient Response:
38ns Full-Scale Settling Time
Single 2.7V to 5.25V Supply
Low Supply Current: 7mA
Shutdown Current: 0.1µA
Tiny 6-Lead SC70 Package
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APPLICATIO S
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, LTC and LT are registered trademarks of Linear Technology Corporation.
RF Receive Power Management
RF Power Control
CATV Power Detection
Optical Receiver Gain Control
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TYPICAL APPLICATIO
Output Voltage
vs RF Input Power
50MHz to 3GHz RF Power Detector
3V
0.1µF
DET
DET
VOUT
VOUT
VOUT (V)
DET
RF
ENABLE
2.0
2
1.6
1
1.2
0
0.8
–1
EN
GND
TA = 25°C
TA = 85°C
TA = –40C
0.4
5534 TA01
0
–60
–50
–40
–30
–20
–10
RF INPUT POWER (dBm)
LINEARITY ERROR (dB)
DET
1nF
RF
INPUT
47Ω
3
VCC = 3V
AT 900MHz
VCC
LT5534
DET
2.4
100pF
–2
0
–3
5534 G05
5534f
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LT5534
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ABSOLUTE MAXIMUM RATINGS
PACKAGE/ORDER INFORMATION
(Note 1)
Power Supply Voltage ........................................... 5.5V
Enable Voltage ................................................... 0V, VCC
RF Voltage (+10dBm Equivalent) ............................ ±1V
Operating Ambient Temperature Range .. – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER PART
NUMBER
TOP VIEW
EN 1
6 RF
GND 2
5 GND
VOUT 3
4 VCC
LT5534ESC6
SC6 PART
MARKING
SC6 PACKAGE
6-LEAD PLASTIC SC70
TJMAX = 125°C, θJA = 256°C/W
LBGD
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
noted. Test circuit shown in Figure 1. (Note 2)
PARAMETER
VCC = 3V, EN = 3V, TA = 25°C, source impedance = 50Ω, unless otherwise
CONDITIONS
MIN
TYP
MAX
UNITS
RF Input
Frequency Range
50 to 3000
MHz
Input Impedance
2
kΩ
–58 to +2
dBm
fRF = 50MHz
RF Input Power Range
Dynamic Range (Note 3)
±3dB Linearity Error, TA = –40°C to 85°C
Output Slope
Output Variation vs Temperature
PIN = –48dBm to –14dBm, TA = –40°C to 85°C
60
dB
44
mV/dB
0.007
dB/°C
–60 to 0
dBm
fRF = 900MHz
RF Input Power Range
Dynamic Range (Note 3)
±3dB Linearity Error, TA = –40°C to 85°C
Output Slope
Output Variation vs Temperature
PIN = –48dBm to –14dBm, TA = –40°C to 85°C
60
dB
41
mV/dB
0.008
dB/°C
–63 to –2
dBm
fRF = 1900MHz
RF Input Power Range
Dynamic Range (Note 3)
±3dB Linearity Error, TA = –40°C to 85°C
Output Slope
61
31
Output Variation vs Temperature
PIN = –48dBm to –14dBm, TA = –40°C to 85°C
Output Intercept
50Ω External Termination, TA = –40°C to 85°C
36.6
dB
43
0.012
–70
–64
mV/dB
dB/°C
–58
dBm
fRF = 2500MHz
RF Input Power Range
Dynamic Range (Note 3)
–63 to –3
±3dB Linearity Error, TA = –40°C to 85°C
Output Slope
Output Variation vs Temperature
PIN = –48dBm to –14dBm, TA = –40°C to 85°C
dBm
60
dB
35
mV/dB
0.025
dB/°C
Output Interface
Output DC Voltage
No RF Input Signal
Output Impedance
Output Bandwidth
Full-Scale Setting Time
Sourcing/Sinking
Input from No Signal to –2dBm, to 90%
30
142
240
mV
32
Ω
30
MHz
38
ns
10/200
mA/µA
5534f
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LT5534
ELECTRICAL CHARACTERISTICS
VCC = 3V, EN = 3V, TA = 25°C, unless otherwise noted.
Test circuit shown in Figure 1. (Note 2)
PARAMETER
Power Up/Down
Turn-On Time
Turn-Off Time
EN = High (On)
EN = Low (Off)
Power Supply
Supply Voltage
Supply Current
Shutdown Current
CONDITIONS
MIN
TYP
MAX
UNITS
0.6
ns
ns
V
V
5.25
9
10
V
mA
µA
200
800
0.9
2.7
5
EN = High
EN = Low
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Specifications over the –40°C to 85°C temperature range are
assured by design, characterization and correlation with statistical process
control.
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0.1
Note 3: The linearity error is calculated by the difference between the
incremental slope of the output and the average output slope from
–48dBm to –14dBm. The dynamic range is defined as the range over
which the linearity error is within ±3dB.
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TYPICAL PERFOR A CE CHARACTERISTICS (Test circuit shown in Figure 1)
Output Voltage vs Frequency
2.4
Linearity Error vs Frequency
3
VCC = 3V
TA = 25°C
50MHz
VCC = 3V
TA = 25°C
2
LINEARITY ERROR (dB)
2.0
50MHz
1.6
1.9GHz
2.5GHz
1.2
0.8
0
–70 –60
–50 –40 –30 –20 –10
RF INPUT POWER (dBm)
1
0
2.5GHz
1.9GHz
–1
–50 –40 –30 –20 –10
RF INPUT POWER (dBm)
–60
5534 G01
1.6
1
1.2
0
0.8
–1
TA = 25°C
TA = 85°C
TA = –40C
0
–60
0
–50
Output Voltage vs RF Input Power
2
1.6
1
1.2
0
–1
0.8
–1
–2
0.4
0
–3
–60
VOUT (V)
TA = –40°C
TA = 85°C
–50
–40
–30
–20
–10
RF INPUT POWER (dBm)
0
5534 G04
0
–60
TA = 25°C
TA = 85°C
TA = –40C
–50
–40
–30
–20
–10
RF INPUT POWER (dBm)
0
5534 G05
VOUT VARIATION (dB)
2
2
VCC = 3V
AT 900MHz
LINEARITY ERROR (dB)
2.0
VCC = 3V AT 50MHz
NORMALIZED AT 25°C
0
–3
VOUT Variation vs RF Input Power
3
2.4
–2
5534 G03
3
1
–40
–30
–20
–10
RF INPUT POWER (dBm)
5534 G02
VOUT Variation vs RF Input Power
3
VOUT VARIATION (dB)
2
0.4
–3
–70
0
2.0
900MHz
–2
0.4
3
VCC = 3V
AT 50MHz
LINEARITY ERROR (dB)
900MHz
VOUT (V)
Output Voltage vs RF Input Power
2.4
VOUT (V)
2.8
VCC = 3V AT 900MHz
NORMALIZED AT 25°C
1
TA = –40°C
0
TA = 85°C
–1
–2
–2
–3
–3
–60
–50
–40
–30
–20
–10
RF INPUT POWER (dBm)
0
5534 G06
5534f
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LT5534
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TYPICAL PERFOR A CE CHARACTERISTICS (Test circuit shown in Figure 1)
Output Voltage vs RF Input Power
2.0
2
2
1.6
1
1.2
0
0.8
–1
TA = 25°C
TA = 85°C
TA = –40C
0.4
–50
–40
–30
–20
–10
RF INPUT POWER (dBm)
0
1.6
1
1.2
0
–1
0.8
–1
–2
–2
0.4
–3
–3
–60
1
TA = 85°C
0
TA = –40°C
VOUT (V)
2
–40
–30
–20
–10
RF INPUT POWER (dBm)
–50
5534 G07
2.8
VOUT (V)
VOUT VARIATION (dB)
50MHz
VCC = 3V, 5V
2.0
TA = 85°C
1.6
1.9GHz
VCC = 3V, 5V
1.2
0.8
–2
0.4
–50
–40
–30
–20
–10
RF INPUT POWER (dBm)
0
0
–60
–50
–30
–10
–40
–20
RF INPUT POWER (dBm)
Output Voltage Distribution
vs Temperature
0
–3
TA = 25°C
TA = –40°C
TA = 85°C
25
20
15
10
5
0
0.54 0.56 0.58 0.6 0.62 0.64 0.66 0.68 0.7
VOUT (V)
5534 G12
Supply Voltage vs Supply Current
10
TA = 25°C
TA = –40°C
TA = 85°C
30
9
SUPPLY CURRENT (mA)
PERCENTAGE DISTRIBUTION (%)
35
RF PIN = –14dBm AT 1.9GHz
VCC = 3V
0
35 RF P = –48dBm AT 1.9GHz
IN
VCC = 3V
30
5534 G11
5534 G10
40
–40
–30
–20
–10
RF INPUT POWER (dBm)
5534 G09
TA = 25°C
TA = –40°C
0
–3
–60
–50
–2
Output Voltage Distribution
vs Temperature
2.4
2
–1
0
–60
Output Voltage vs RF Input Power
at VCC = 3V and 5V
VCC = 3V AT 2.5GHz
NORMALIZED AT 25°C
1
0
TA = 25°C
TA = 85°C
TA = –40C
5534 G08
VOUT Variation vs RF Input Power
3
3
VCC = 3V
AT 2.5GHz
PERCENTAGE DISTRIBUTION (%)
0
–60
VCC = 3V AT 1.9GHz
NORMALIZED AT 25°C
2.0
VOUT VARIATION (dB)
VCC = 3V
AT 1.9GHz
Output Voltage vs RF Input Power
2.4
LINEARITY ERROR (dB)
3
LINEARITY ERROR (dB)
VOUT (V)
VOUT Variation vs RF Input Power
3
2.4
25
20
15
10
TA = 85°C
8
TA = 25°C
7
TA = –40°C
6
5
5
0
1.79 1.81 1.83 1.85 1.87 1.89 1.91 1.93
VOUT (V)
5534 G13
4
2.5
3
3.5
4
4.5
SUPPLY VOLTAGE (V)
5
5.5
5530 G14
5534f
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LT5534
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TYPICAL PERFOR A CE CHARACTERISTICS (Test circuit shown in Figure 1)
RF Input Return Loss vs Frequency
Output Transient Response
0
–5
RETURN LOSS (dB)
1V/DIV
VOUT
–10
–15
–20
RF
INPUT
PULSED RF
0dBm AT 100MHz
–25
–30
2.5
1
1.5
2
0.5
RF INPUT FREQUENCY (GHz)
0
3
50ns/DIV
5534 G16
5534 G15
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PI FU CTIO S
VCC (Pin 4): Power Supply. This pin should be decoupled
using 100pF and 0.1µF capacitors.
EN (Pin 1): Enable. When the input voltage is higher than
0.9V, the circuit is completely turned on. When the input
voltage is less than 0.6V, the circuit is turned off.
RF (Pin 6): RF input. This pin is internally biased to
VCC – 0.18V. A coupling capacitor must be used to connect
to the RF signal source.
GND (Pins 2, 5): Ground.
VOUT (Pin 3): RF Detector Output.
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BLOCK DIAGRA
4
VCC
DET
DET
RF LIMITER
6
DET
RF LIMITER
DET
RF LIMITER
DET
+
–
RF LIMITER
RF
VOUT
3
VREF
OFFSET
COMP
2
GND
5
BIAS
1
EN
5534 BD
5534f
5
LT5534
TEST CIRCUIT
C1
1nF
6
RF
LT5534
5
2
GND
GND
1
EN
R2
0Ω
OPTIONAL
VOUT
3
EN
VOUT
C5
OPTIONAL
VCC
R1
47Ω
OPTIONAL
4
J1
RF
VCC
C3
100pF
C2
0.1µF
5534 F01
REF DES VALUE
C1
1nF
C2
0.1µF
C3
100pF
C5
R1
47Ω
R2
0Ω
SIZE
0402
0603
0603
0603
0402
0603
PART NUMBER
AVX 04025C102JAT2A
TAIYO YUDEN TMK107BJ104KA
AVX 06035C101KAT2A
OPTIONAL
OPTIONAL
OPTIONAL
Figure 1. Evaluation Circuit Schematic
Figure 2. Component Side Silkscreen of Evaluation Board
Figure 3. Component Side Layout of Evaluation Board
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APPLICATIO S I FOR ATIO
The LT5534 is a logarithmic-based detector, capable of
measuring an RF signal over the frequency range from
50MHz to 3GHz. The 60dB linear dynamic range is achieved
with very stable output over the full temperature range from
–40°C to 85°C. The absolute variation over temperature is
typically within ±1dB over a 47dB dynamic range at 1.9GHz.
matching components. A 47Ω resistor (R1) connected to
ground will provide better than 10dB input return loss up
to 2.5GHz. An additional 2nH inductance in series with R1
will provide improved input matching up to 3GHz. The
impedance vs frequency of the RF input is detailed in
Table␣ 1.
RF Input Port
The approximate linear RF input power range of the
LT5534 is from –62dBm to –2dBm with a 50Ω source
impedance. However, this range can be adjusted either
upward or downward to tailor for a particular application
The RF port is internally biased at VCC-0.18V. The pin
should be DC blocked when connected to ground or other
5534f
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LT5534
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APPLICATIO S I FOR ATIO
Table 1. RF Input Impedance
VCC
FREQUENCY
(MHz)
INPUT
IMPEDANCE (Ω)
MAG
50
1429-j429
0.938
–1.1
100
947-j710
0.934
–2.9
200
509-j609
0.922
–5.6
400
250-j440
0.908
–9.9
600
149-j344
0.900
–14.1
800
96.8-j278
0.896
–18.3
1000
67.6-j229
0.893
–22.7
1200
49.7-j193
0.889
–27.3
1400
38.4-j165
0.883
–32.3
1600
30.8-j143
0.879
–37.3
1800
25.4-j125
0.873
–42.6
2000
21.4-j109
0.866
–48.0
2200
18.5-j96.2
0.862
–53.6
2400
16.6-j85.0
0.848
–59.6
2600
15.2-j75.7
0.834
–65.6
2800
13.7-j67.5
0.826
–71.8
3000
12.1-j60.1
0.822
–78.2
+
S11
ANGLE (DEG)
need. By simply inserting an attenuator in front of the RF
input, the power range is shifted higher by the amount of
the attenuation. Moreover, due to the high RF input
impedance of the LT5534, the detecting range can be
moved downward for better detection sensitivity by using
a narrow band L-C matching network. By this means, the
sensitivity of the detector can be extended to as low as –
75dBm. By changing the value of resistor R1, the sensitivity of the detector can be fine-tuned within the range
from –75dBm to –62dBm. Though the range is adjustable, the overall linear dynamic range remains the same.
Output Interface
The output interface of the LT5534 is shown in Figure 4. The
output currents from the RF detectors are summed and
converted into an output voltage, VOUT. The maximum
charging current available to the output load is about 200µA.
The internal compensation capacitor CC is used to guarantee stable operation for a large capacitive output load. The
slew rate is 133V/µs, and the small-signal output bandwidth
is approximately 30MHz when the output is resistively
200µA
+
CC
VOUT
–
5534 F04
OUTPUT CURRENTS
FROM RF DETECTORS
Figure 4. Simplified Circuit Schematic
of the Output Interface
terminated or open. The fastest output transient response
is achieved when a large signal is applied to the RF input
port. See the output transient response plot in the Typical
Performance Characteristics section.
When the output is terminated with a load capacitance
CL, the slew rate is then limited to 200µA/(CL + 1.5pF). For
example, the slew rate is reduced to 17.4V/µs when CL =
10pF. A capacitive load may result in output voltage
overshoot, which can be minimized with a series compensation resistor R2 as shown in Figure 1. The suggested
resistor values for various capacitive loads are listed in
Table 2.
Table 2. Resistor Value for Capacitive Output
C5 (pF)
R2 (kΩ)
1.5
5
5
4
10
2.5
20
2
The optional RC network at the output (R2 and C5 on the
demo board) can also provide further output filtering, if
needed. The output bandwidth is primarily dictated by the
RC constant of this lowpass filter when its corner frequency is less than 30MHz.
When a large signal (e.g., –2dBm) is present at the RF
input port, the output voltage swing can be as high as 2.4V.
To assure proper operation of the chip, the minimum
resistive load at the output termination should be greater
than 18kΩ.
5534f
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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LT5534
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PACKAGE DESCRIPTIO
SC6 Package
6-Lead Plastic SC70
(Reference LTC DWG # 05-08-1638)
0.47
MAX
0.65
REF
1.80 – 2.20
(NOTE 4)
1.16 REF
0.96 MIN
3.26 MAX 2.1 REF
INDEX AREA
(NOTE 6)
1.80 – 2.40 1.15 – 1.35
(NOTE 4)
PIN 1
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.15 – 0.30
6 PLCS (NOTE 3)
0.65 BSC
0.10 – 0.40
0.80 – 1.00
0.00 – 0.10
REF
1.00 MAX
0.10 – 0.30
SC6 SC70 0802
0.10 – 0.18
(NOTE 3)
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. DETAILS OF THE PIN 1 INDENTIFIER ARE OPTIONAL,
BUT MUST BE LOCATED WITHIN THE INDEX AREA
7. EIAJ PACKAGE REFERENCE IS EIAJ SC-70
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PART NUMBER
DESCRIPTION
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LT5546
500MHz Quadrature IF Demodulator with VGA and 17MHz
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5534f
8
Linear Technology Corporation
LT/TP 0404 1K • PRINTED IN THE USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2004